1) Skirmishes with the use of all types of heavy automatic weapons between organized parties, as well as their capture of a city without fighting, are considered hostilities. for example, Prigozhin's mutiny in Rostov would be considered hostilities, as there is evidence of the capture of the city, as well as evidence of skirmishes with border guards and aviation. The terrorist attack at Crocus City Hall is not hostilities because it was directed against civilians, not an organized party to the conflict.

Also, any arson, sabotage, etc. will not be considered hostilities until the guerrillas publish the program of their organization and go with weapons to seize barracks, police, etc.

2) ANY sides. AFU, Ministry of Defense, NATO forces, PMCs, Islamists, communists, even aliens, if they are organized and shooting at each other, it counts.

3) The results are not important, it is the fact of fighting that counts.

4) If there is uncertainty about territory, the official city boundaries at the time the question was posted will be used.

5) If there are possible inaccuracies, ask questions in the comments.